1 The circuit diagram to the right shows a real battery, with internal resistance r, wired to an ext

1
Quiz 7
1) The circuit diagram to the right shows a real
battery, with internal resistance r, wired to an
external resistor R. The battery has an emf of
22V and the external resistor R110?, however the
internal resistance is unknown. If a voltage of
20V is measured across R what is the internal
resistance r of of the battery ?

• 2) The circuit diagram to the right shows 3
  resistors connected in series to an ideal
  battery. Assume R112?, R224? and R33?.
• Determine the single equivalent resistance Req
  for all 3 resistors.
• b) If the battery provides a 10V emf, what is
  the voltage across R2 ?